mm/damon: remove return value from before_terminate callback

Since the return value of 'before_terminate' callback is never used, we
make it have no return value.

Link: https://lkml.kernel.org/r/20211029005023.8895-1-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 321de9d..b4d4be3 100644 (file)
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -322,7 +322,7 @@ struct damon_callback {
        int (*before_start)(struct damon_ctx *context);
        int (*after_sampling)(struct damon_ctx *context);
        int (*after_aggregation)(struct damon_ctx *context);
-       int (*before_terminate)(struct damon_ctx *context);
+       void (*before_terminate)(struct damon_ctx *context);
 };
 
 /**

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index befb27a..eccc14b 100644 (file)
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -645,18 +645,17 @@ static void dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx)
                debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]);
 }
 
-static int dbgfs_before_terminate(struct damon_ctx *ctx)
+static void dbgfs_before_terminate(struct damon_ctx *ctx)
 {
        struct damon_target *t, *next;
 
        if (!targetid_is_pid(ctx))
-               return 0;
+               return;
 
        damon_for_each_target_safe(t, next, ctx) {
                put_pid((struct pid *)t->id);
                damon_destroy_target(t);
        }
-       return 0;
 }
 
 static struct damon_ctx *dbgfs_new_ctx(void)